C# Getting data from "Control" type to store assortment of other Controls (CheckBox/TextBox/NumericUpDown etc)

I have a type that contains a few strings and a generic Control, My problem is that I don't know how to access the data that is stored inside the control.

Basically My program loops through some "custom types" which have _control "Children" which are then assigned to New CheckBox or other form controls.

    private Control _control { get; set; }
    public void set_control(Control control) { this._control = control; } 

elsewhere
x.set_control(new CheckBox { Dock = DockStyle.Fill, AutoSize = false, Text = x.name(), Checked = Convert.ToBoolean(x.data()) }); x.control().Click += delegate { refresh_data(x); };

psudo Code

private void refresh_data(embedded_setting setting) { if(setting.control().GetType() == typeof(CheckBox)) { setting.set_data(setting.control()); } }
I need to set_data to control.checked.tostring. But im not sure how to use the control type as if its a checkbox type.

I'm hoping it can be carried over to be used with TextBox.Text and NumericUpDown.Value as well.

Hopefully the question makes sense, let me know if it doesn't.